After applied as rest position mesh doesn't move
If you have nothing to loose, delete and regenerate your rig.
When i reset my rig i select all the bones and then
Select all the bones, in pose mode with A. Then, hit:
ALT R to reset all rotations,
ALT G to reset all translations,
ALT S to reset all scales.
Or select all bones (A) and hit space. Then search for &quot;clear pose&quot;